Carbon feed for arc lamps



May 20, 1930. L.. A. ROSENHAHN CARBON FOR ARC LAMPS Filed OCt,` 20, 1926 2 Sheets-Sheet l May 20, 1930. A. RosNHAHN 1,758,979

CARBON FEED FOR ARG LAMPS Filed Oct. 20, 1926 2 Sheets-Sheet 2 f/ff /4Z V 2 2 4L j J7 38 f J7 39 @W24/1@ d/f 40 Patented May 20, 1930 UNITED STATES LEOPOLD A. ROSENHAHN, OF LOS ANGELES, CALIFORNIA CARBON FEED FOR ARC LAMPS Application filed October 20, 1926.

My invention is a carbon feed for arc lamps and in the carbon structure itself.

An object of my invention is the construction of a carbon feed appliance for arc lamps which will rotate the carbon and feed same gradually and steadily with a continuous forward movement, this movement being at the desired rate in accordance with the consumption of the carbon.

Another object of my invention is the construction of a carbon having a special exterior surface which will allow feeding of same.

lVIore specifically an object of my invention is to feed a carbon by rollers having threads, said threads feeding the carbon forward at the proper rate, the threaded rollers being held stationary, the carbon rotated in a suitable rotary holder.

In regard tothe carbon, my invention comprises forming the carbon with screw threads on its exterior surface so that the carbon may be fed by the engagement of the threads on the carbon and the threads on the rollers being stationary and the carbon rotated.

In construct-ing my invention I have a suitable mounting with a rotary hub mounted therein, this hub having guide rolls which engage the carbon on opposite sides, allowing its longitudinal movement, the rotation of 3U the hub with the guide rollers secured thereto turning the carbon. In connection with same I have a stationary n'iounting with rollers having a screw threaded periphery, these rollers being pressable towards the carbon and engaging' same with the desired pressure. Therefore when the carbon is rotated the threaded rolls feed same forward at the desired speed.

My invention will be more readily understood from the following description and drawings, in which;

Figure 1 is a plan view of my carbon feeding appliance as if taken in the direction of the arrow 1 of Fig. 2;

Fig. 2 is a side elevation taken in the direction of the arrow 2 of` Fig. 1;

Fig. 3 is a vertical cross section on the line 3 3 of Fig, 2 in the direction of the arrows, showing the mounting of the threaded feeding rollers;

Serial No. 142,862.

Fig. 4 is a vertical transverse section on the line. 4-4 of Fig. 2 in the direction of the arrows, showing the construction and mounting of the turning rollers;

Fig. 5 is a vertical longitudinal section taken on the line 5-5 of Fig. 1 in the direction of the arrows;

Fig. 6 is a diagranunatic view showing my type of carbon having threads on its exterior surface coacting with threaded feed rollers;

Fig. 7 is a detail of an alternative feed in which sharp cutting discs set at an angle are utilized to feed the carbon, such discs cutting into the surface of the carbon sufficiently to grip and feed same;

Fig. 8 is a diagram of an alternative construction in which the carbon is threaded, the rollers are mounted with their axes at the proper inclination, such rollers having parallel teeth to engage the threads of thev carbon, the plurality of rollers feeding the carbon forward.

The xed frame for mounting the carbon feeding device is substantially as follows A suitable base 1 has a backing plate 2 secured to same in a suitable manner and has a rear journal plate 3 extending upwardly. This plate has a circular opening 4 forming a journal as hereunder set forth. A socket 5 is constructed preferably t the upper portion of the plate 3,. being formed integral therewith and has a compression spring (S fitted therein.

A heavy cage is secured to the forward end of the plate 2, such plate having a central bore 8 and with a series of ribs 9 extending from the bore to the outer circumference. A fixed collar 10 is secured to the cage and has a lug 11 extending upwardly therefrom. A protective plate 12 having a sheet of afs'- bestos 13 or the like is secured to the cage by means of screws 14 or other fastening.

The mechanism for rotating the carbonv is substantially as follows: y

The carbon is designated by the numeral 15 and is fitted in an elongated hub 16 having a central bore 17 therethrough. This hub has one end journaled in the circular opening 4 of the plate 3 and the other end journaled in the yfined coll-ar 10. The hub is formed with a pair of vopposite plates 18 such plates having slots 19 therein. U- shaped arms 2O are mounted on pivot pins 21 extending through the opposite plates 18 and have turning rollers 22 mounted on axles 23 on the ends of said arms. These rollers are each provided with a pair of discs 24, fthe discs engaging the carbon as illustrated 'in Fig. 4, there being a clearance between thecarbon and the rolls proper. The ends 25 of the axles 23 extend Athrough the slots 19 'of the plates 18 and the opposite axles are 'connected by tension springs 26, thus shaft 30. The longitudinal feed of the carbon is provided by rollers 31 which preferably have screwcthreads 82 cut on their periphery, these rollers being mounted on axles 38 held in sliding ournal boxes 34, these journal boxes being mounted in slideways 35 of the cage.

Referring to Fig. 3, it will be seen that two of the slideways have screw threaded plugs 36 which may be adjusted to force the journal boxes inwardly towards the carbon, .the other or top slicleway has the lever 87 mounted on a pivot pin 38 on the stud 11, the free end 39 of the lever being engaged by the spring 6, there being slots 40 in the socket 5 to allow movement of the free end of the lever and slots 41 in the cage to allow movement of the end of the vlever engaging the journal box. c

The carbon preferably has screw threads 42 formed thereon by molding or in any other suitable manner. These do not need to be very deep as the threads 32 on the rollers 31 should be cut sufiiciently sharp so that they will cut slightly into the carbon.

The operation of my device is substantially as follows:

On rotation of the shaft 30 through the medium of the gears 29 and 27 the hub 1G is rotated and in such rotation carries the. rollers 22 with the discs 24. These discs are drawn into close Contact with the periphery of the carbon by the springs 25. Therefore the carbon is given a turning or rotary movenient. On account of the feed rollers 81 being held stationary and pressed tight against the carbon, the carbon is fed forward.

It will be understood that the single roller at the top being pressed by the action of the spring 6 and the lever 37 against the carbon will force the carbon tightly against the other feed rollers. As the thread on the carbon may be made of any desired pitch and threads on the rollers 31 of suitable pitch, it will be manifest that the feed of the carbon may be as slow as desired or as rapidly as desired and will always be at a uniform rate provided the carbon is rotated at a constant speed, which circumstance is readily obtained.

It is to be understood that the carbon may have a smooth periphery as illustrated in Figs. 5 and 7 fand that the feed rollers having the threads cut sharp on same will grip the surface of the carbon sufficiently tight to feed same forward in a steady manner.

In Fig. 7 one of the group of say three or more feeding discs is indicated by the numeral V43, having a sharp cutting edge 44, these being mounted on axles 45 which would be tilted slightly in reference to the axes of the carbon. It will therefore be seen that when a plurality of rollers or discs are so mounted in the journal boxes 34 the carbon may be fed forwardly. Y v

In Fig. 8 the feeding rollers 46 are shown as having parallel teeth 47, these rollers having axles 48 at an inclination and when a plurality of such rollers are used they may feed either smooth surfaced carbons or carbons having threads cut in saine. n

From the above description it will be seen that I have developed a simple appliance for giving a steady feed and rotation to carbons for arc lamps or the like and that in utilizing my invention threaded feeding rollers may be used on smooth surfaced carbons or on threaded cai'bons and also feeding rollers or discs having slightv cutting edges, such rollers being mounted at an inclination may be used to feed the carbon whether from a smooth surface or threaded surface. c

My invention also comprises a method of feeding carbons for'arc lamps in that the carbons are continuously rotated and the threaded carbons are continuously engaged by threading rollers having threads thereon, which thus continuously feed the carbons.

Various changes may be made in the principles of my invention without departing from the spirit thereof as set forthv in the description, drawings and claims.

lVliat I claim is:

1. A carbon feed for arc lamps comprising in combination a carbon having screw threads directly on its periphery, means to rotate the carbon, and means engaging the threads to feed the carbon forwardly.

2. A carbon feed for arc lamps comprising in combination a carbon having screw threads directly thereon, means torotate the l carbon, and non-driven rollers having threads on their face to continuously engagev the threads of the carbon and feed same forwardly.

3. A carbon feed comprising in combination a -fixed cage having a central bore and a plurality of journal boxes slidable radially, rollers having sharp peripheral edges journaled in said boxes to engage the carbon,

means to adjust some of said journal boxes radially, an arm, means pivotally connecting same to the cage, one end of the arm bearing on one of the journal boxes to thrust same inwardly, a spring engaging the other end 0f the arm thrusting same outwardly, and means to rotate the carbon.

4. A carbon feed as claimed in claim 3, the means to rotate the carbon comprising a hub surrounding the carbon having one end journaled in the cage, a plate having a socket forming a journal for the other end of the hub, a spring being mounted in the socket and engaging thel lever, a plurality of rollers journaled transversely in the hub and engaging the carbon, and means to rotate the hub.

5. In a carbon feed, a carbon having a screw threaded peripheral surface, a plurality of non-driven rollers having sharp peripheral edges to engage the said threads, and means to rotate the carbon whereby the rollers feed the carbon forwardly by engaging said threads.

6. A carbon feed for arc lamps comprising in combinaton a carbon having screw threads directly on its periphery, means to support said carbon, and means to rotate the carbon continuously on its axis, a plurality of feeding rollers, each of said rollers having screw threads to correspond to that of the carbon, said rollers being non-driven and remaining in substantially the same position to give the carbon a continuous feed.

7. A carbon feed for arc lamps comprising in combination a cage having an axial passage therethrough, a carbon extending centrally through said passage and having a screw thread thereon, a plurality of radial slideways, plugs fitted in said slideways and each having a feeding roller thereon, said rollers having screw threads and being nondriven, means to press one of the rollers against the carbon to cause an engagement between the other rollers and the carbon, said rollers having their axes inclined to the axis of the carbon, and means to continuously rotate the carbon independently of said rollers, whereby the said rollers feed the carbon continuously forward.

8. A carbon feed comprising in combination a carbon having a screw thread on its periphery, means to support said carbon, a plurality of feeding rollers, each having a thread on its periphery to engage the thread of the carbon and having their axes inclined to the axis of the carbon, said feeding rollers being non-driven, and means to continuously rotate the carbon independently of the rollers, the said rollers feeding the carbon forward.

9. The method of feeding cal-bons for arc lamps comprising continuously rotating a carbon having a screw thread thereon, and engaging said screw thread by a structure whereby the rotation of the carbon continuously feeds the carbon forward.

lO. The method of feeding carbons for arc lamps comprising continuously rotating a carbon having a screw thread on its periphery, engaging said thread by non-driven and continuously acting feeding rollers engaging the threads, the action of rotating the carbon and the engagement of the threads feeding the carbon continuously forward.

l1. In a carbon fee-d, a carbon having a screw threaded peripheral surface, a plurality of non-driven rollers having grooves on their peripheral surface to engage said threads and means to rotate the carbon whereby the rollers feed the carbon forwardly by engaging the said threads.

1Q. A carbon feed comprising in combination a xed cage having a central bore and a plurality of journal boxes slidable radially, rollers having sharp peripheral edges journaled in said boxes to engage the carbon, means to adjust some of said journal boxes radially, an arm, means pivotally connecting same to the cage, one end of the arm bearing on one of the journal boxes to thrust same inwardly, a spring engaging the other end of the arm thrusting same outwardly, means to rotate the carbon, there being a plurality of U-shaped arms pivotally connected to the hub, the transverse rollers being mounted in said arms. s

In testimony whereof I have signed my name to this specification.

L. A. ROSENHAHN. 

